Leukemia:维生素C能诱导IDH1突变的急性髓系白血病的表观遗传修饰

2018-01-24 MedSci MedSci原创

科学家在白血病模型中设计了一个研究vitamin C在驱动分化的转录因子结合位点诱导表观遗传修饰的研究模型,从而揭示了vitamin C 的表观修饰作用。

急性髓系白血病患者基因组ten-eleven translocation 2(TET2)和isocitrate dehydrogenase1 and 2(IDH1/2)编码序列中存在的经常性突变,而最近的研究表明这些突变有可能是"开拓者"突变并且存在于前白血病细胞中。抗坏血酸(vitamin C)是水溶性的人体必需的营养物质,并且作为普通的培养基添加剂能够提高细胞增殖能力。免疫细胞和脑细胞中有高水平的vitamin C,在这些细胞中vitamin C能够维持铁处于二价状态。另外在体外研究中,vitamin C和TET2的催化结构域相接触。而之前的研究也发现Vitamin C对H3K9和5mC去甲基化,从而提高诱导性多能干细胞的产生效率,以及诱导小鼠胚胎干细胞的为胚胎样状态。这些表明vitamin C参与表观遗传修饰。

髓系恶性血液疾病的基因组的特征是表观遗传异常。急性髓系白血病基因组中异质性,失活TET2突变以及IDH1突变是经常性和互相排斥的事件。抗坏血酸(vitamin C)在体外具有刺激TET2催化活性,并且因此科学家研究它在表达IDH1 R132H突变的白血病模型中的作用。Vitamin C处理能诱导IDH1 R132H依赖的细胞增殖降低,并且会导致白细胞分化基因的表达上升。Vitamin C诱导不同甲基化区域,而这些区域于髓系分化相关的增强子区域有明显的重叠,并且在造血转录因子CEBPβ,HIF1α,RUNX1和PU.1的序列原件中富集。另外,vitamin C诱导RUNX1结合的H2K27ac侧链增加。科学家在白血病模型中设计了一个研究vitamin C在驱动分化的转录因子结合位点诱导表观遗传修饰的研究模型,从而揭示了vitamin C 的表观修饰作用。

原文出处:Mingay M, Chaturvedi A, Bilenky M, et al. Vitamin C-induced epigenomic remodelling in IDH1 mutant acute myeloid leukaemia[J]. Leukemia, 2017.doi:10.1038/leu.2017.171

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    2018-01-29 jyzxjiangqin

    急性髓系白血病的治疗.

    0

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    2018-01-26 zhangyxzsh
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    2018-01-24 1e0e5a1fm42(暂无匿称)

    henhao

    0

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    2018-01-24 Jackie Li

    学习

    0

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